:root {
    --percentage: 0%;
  }
  
  body {
    background-color: #000;
    margin: 0;
    height: 300vh;
  }
  
  .sticky {
    position: sticky;
    top: 0;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  
  h1 {
    font-family: Helvetica;
    margin: 0;
    padding: 0;
    font-size: 48px;
    color: #fff;
    letter-spacing: -0.3px;
    
    background-image: linear-gradient(75deg, rgba(255, 255, 255, 1) 0%, rgba(255, 255, 255, 1) 33.33%, rgba(255, 255, 255, 0) 66.67%, rgba(255, 255, 255, 0) 100%);
    background-size: 300% 100%;
    background-position-x: calc(100% - var(--percentage));
    
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
  }